Joint holder and edging unit



June 8, 1937; R. RVRoBERTsoN 2,082,978

J..1 HOLDER AND EDGING UNIT Filed Nov. 14, 1955 v s sheets-sheet 1 il IlJune 85,1937. R. RvRoBhl-:RTso'N l 2,082,978 n N NG NIT FiledNov; 14,1935 s sheets-sheet 2 R. R. ROBERTSON JOINT HOLDER AND EDGING UNIT June8, 1937.

Filed Nov. 14, 1955 3 Sheets-Sheet 3 irme 8, 1937 PATENT OFFICE JOINT'Homan AND EDGmG UNIT Robert It. Robertson, Chicago, Ill., assigner toThe Translode Joint' Company, Chicago, Ill., a corporation of IllinoisApplication November 14. 1935. Serial No. 49,695

' 21 claims. (ci. :a4-5i) In the construction of concrete roads and thelike. it has been the practice to provide expansion joints at spacedintervals, said joints being formed by means of expansion joint formingf 5 mechanisms, parts of which are left in they concrete, and otherparts of which are removed after the pouring of the concrete. During thepouring of the concrete, diiiiculties have been encountered in holdingthe expansion joint forming l -mechanisms in'their proper positions onthe road subgrade, due to the fact that as the concrete is poured andpushed into position. the expansion joint mechanisms have either beenpushed out of place or tipped over, thereby requiring replacel ment 'ofthe joint forming mechanisms and re-` positioning o! the same, causingloss of time and i additional expense,

The present invention has been devised to obviate the dimcultieshereinbeiore encountered in holding expansion joint forming mechanismsin position during `the pouring of concrete. The present inventionrelates more particularly to a combination expansion joint holder andedging unit for use in connection with a load transmission expansionjoint forming mechanism, including a precast plastic core or fillerhaving an asphalt top seal or head secured across the-top thereof intowhich the tapered pins of a steel edging bar are adapted to be pressed,after which the edging bar is enclosed by means of a protecting hood orcap forming part oi the joint holding mechanisms, which are removablebefore the last pass of the road nnishing machine to permit properrounding or edging of the upper edges of the concrete slabs andremovalof the edging bar and pins after the initial set of the concrete.

It is an object of this invention to provide an improved removable jointholder for holding an expansion joint forming unit in position duringthepouring of concrete in the formation of a.

road or the like.

It is also an object of this invention to provide i. narrow removableedging unit for removable engagement on the upper surface of a plasticjoint filler, and beneath a protecting cap forming part of a jointholder used for holding the joint forming mechanism in position duringthe pouring of concrete. and removable from the concrete While it isstill soit, thereby exposing the edging unit to permit rounding oredging of the upper corners of the concrete slabs, allowing the edgingunit to be removed after the initial set of the concrete to provide avoid above the plastic iiller forming the joint for the reception of acompound filler for filling the top of the iinished joint.

It is a further object of this invention to provide a removable narrowedging unit for positioning upon the top of a transload joint formingmechanism to provide anarrow crack between the adjacent upper portions of concrete road slabs above the expansion joint mechanismsA to beyfilled with a compound ller to form a plastic closure for the topof thejoint, which is comparatively narrow when compared with the width of theexpansion joint mechanisms separating the road slabs beneath the toplller.

It is furthermore an object of this invention to provide a loadtransmission expansion joint unit including a plastic core provided'with a metal cross plate or a wide plastic head or a combinaby means ofconcrete pouring and finishing machines.

It is an important object of this invention to provide a joint holderand edging unit for use in the construction of concrete roads and thelike, with said holder formed to permit the same to be removed beforethe last pass of the concrete finishing machine, to uncover a narrowedging unit releasably supported on the top of the expansion jointfiller core to permit rounding or edging of the upper edges of adjacentconcrete slabs, to form a narrow crack for the recept-ion of a compoundller above the plastic ller core of an expansion joint formed betweenthe concrete road slabs. j

Other and further important objects of this invention will be aparentfrom the disclosures in the specification and the accompanying drawings.

The-invention (in a preferred form) is illustrated in the drawings andhereinafter more fully described.

On the drawings:

Figure' 1 is a. fragmentary top plan view oi' a load transmissionexpansion joint forming mechanism including a removable edging unit anda section taken on line II-II of Figure 1, showing the concrete roadslabs in position for embedding the expansion joint mechanisms and theedging and holding units before the last pass of the finishing machine,and while the concrete is still soft to permit removal f the jointholder.

Figure 3 is a similar fragmentary cross section ofthe expansion jointillustrated in Figure 2 after the removal of the joint holder, butv withthe edging unit still in position upon the top of the joint filler tofacilitate edging of the upper edges of the concrete slabs, prior to theinitial set of the concrete when the edging unit is removed to provide anarrow crack above the expansion joint illler and between the upperportions of the adjacent road slabs.

Figure 4 is a fragmentary vertical section through the upper portion ofthe. finished ex- -pansion joint after the removal of the edging unit,and after a compound flller has been poured into the narrow top 'crackof the joint above the wide head of the main ller forming part of theexpansion joint.

Figure 5 is a fragmentary vertical section similar to that illustratedin Figure 2 of the upper portion of a modified form of core unitprovided with a metal plate cross head between the plastic core and themetal edging unit.

Figure 6 is a fragmentary isometric view of the metal cross head plate,of the type shown in Figure 5, removed from the joint.

Figure 7 is a fragmentary vertical section through the upper portion ofan expansion joint core and edging unit having engaged therebetweenanother modiiied form of a metal cross head for a joint.

Figure 8 is a fragmentary isometric view of the upper portion of thecore and metal cross head illustrated in Figure 'l showing the wedgingpins in section.

Figure 9 is an enlargedfragmentary isometric sectional view of anothermodified form of expansion joint forming mechanism wherein a groovedmetal cross head plate is engaged between the top of the plastic coreand a plastic cross head on which the edging unit is supported.

Figure 10 is a fragmentary isometric sectional view of another modiiiedform of expansion joint forming mechanism in which another modified formof a cap type metal cross head is engaged on the top of the jointforming core for the support of the edging unit.

As shown on the drawings:

The. present invention relates to an improved road expansion jointforming mechanism, of the l load transmission type, and includes aremovable edging unit and a joint holder serving the double purpose ofenclosing the edging unit during the Ypouring of concrete, and alsoacting as a brace for supporting the expansion joint forming mechanismin place during the pouring of the concrete to form road slabs onopposite sides of the joint.

In the present showing, the reference numeral I indicates a roadsubgrade upon which con'crete is deposited to form the concrete roadslabs 2 separated from one another by means of the improved loadtransmission expansion joint and mechanism. The improved metal edgingunit and the joint holder form subcombinations ofthe joint formingmechanisms, which include in combination a load transmission base unitwhich carries a filler or core unit upon which the edging, the base unitof the joint comprises an elongated base member consisting of a solidbase plate 3 constructed of sheet metal or other suitable material.'I'he longitudinal margins of the base plate 3 are bent .upwardly andthen inwardly toward one another to form oppositely positioned guidechannels. 4. The guide channels 4 of the base unit provide oppositelypositioned guide grooves 5. 'Ihe margins vof the top plates of the guidechannels 4 are bent upwardly and are cut away to provide spaced upwardlyprojecting retaining flanges 6, which are arranged in staggered relationon opposite sides of the base unit. Notches are provided between theretaining flanges 6 on each side of the base unit to per-l mit loadtransmitting anchor shoes or holders to be seated therein in properspaced relation for the support of a core unit or illler hereinaftermore fully described.

The load transmitting ldevices associated with the base unit consist-ofa plurality of anchor shoes or holders, which are movably or shiftablyengaged in the base section and are arranged longitudinally in offset orstaggered relation with right flange or web 8 integral with the baseflange. Struck outwardly from the upper margin of each of the uprightflanges or webs 8. are anchoring blades or wings 9 leaving the innerside of the upright flange or web iiat.

Supported on the base anges 'I of the anchor shoes between the uprightflanges or webs 8 is a pre-molded asphalt ller or core board Ihavingstaggered rows of bosses or knobs II and sockets or recesses I2formed on each side thereof. Seated upon the top edge of the plasticfiller I0, and secured thereto bymeans of nails is a top seal -in theform of a plastic ller head I3 constructed of asphalt or a similarmaterial. Metal core plates I6 are provided on opposite sides of theller I0 in contact with the outer surfaces of the knobs or bosses II.The plates II- project' down into the base unit adjacent the inner facesof the upright flanges 8 of the anchor shoes. The upper margins of theplates I6 are bentinto the form of angle strips I5 which seat againstthe lower side corners of the illler crosshead I3 to close the top ofthe illler chamber in which the core or ller Il! is disposed.

Disposed longitudinally upon the illler head lI3 midway between thesides thereof is a. removable steel edging bar IB having rigidly securedin spaced openings in the bottom surface thereof of a row of taperedpins or pegs I'I which are adapted to be pressed or forced into theplastic illler head- I3 by pushing the edging bar into position upon thetop surface of the head I3 as illustrated in Figure 2. The edging bar I6isl removable for reuseand as clearly illustrated in Figures 2 and 3 iscomparatively narrow in order to provide a narrow top groove or crack I8between the upper portions of the concrete slabs I.

During the pouring of the concrete, the edging bar I6 is inclosed bymeans of a. long hood or cap I9 of substantially horseshoe shapedcrosssection as shown in Figure 2. The channel cap I9 when is use ispositioned with the open bottom thereof seated upon the top surface ofthe illler head I3 and forms part of a joint holder which upwardly outof engagement with the filler head is used for the purpose of securelybracing the joint `forming mechanisms in position during the pouring ofconcrete. The joint holder includes the channel cap I9 which has securedto one side thereof a plurality of spaced angle brackets 20 each ofwhich is provided ,with an lopening or hole near the outer end thereof.Welded or otherwise secured to the bottom of each of the angle brackets20 is an inclined brace or supporting leg 2i of a length sulcient topermit the lower end to rest upon the top of, one of the guide channels4 forming part of the load transmission base unit. Also welded or,otherwise secured to the bottom of each of the angle brackets 20 is anangle stop bracket 22, one flange of which projects downwardly to serveas a stop for engagement against one side of the filler head I3.

yRemovably projecting downwardly through the opening in each of theangle brackets 20 is an anchoring stake' 23, the lower end of which isprovided with a tapered tip 24 to permit the stake to be driven into thesubgrade I. Secured in the upper end of each of the stakes 23 is anoutwardly projecting arm or handle 25 to facilitate removal of thestakes after the pouring of concrete and before the last pass of theflnishing machine. The handles 25 also prevent the stakes 23 from beingdriven through the brackets 2li.

yAfterl the expansion joint forming mechanisms are positioned 'upon thesubgrade as illustrated in Figure 2 and the stakes 23 are driven intothe subgrade to hold the joint forming mechanisms braced in position onthe side opposite the side against which the concrete is adapted to bedeposited by a concrete machine, concrete is deposited by the concretefurnishingy machine and as the machine advances toward the joint formingmechanisms the concrete is pushed into position and over the top of thejoint into the space on the opposite side oi the joint where the jointholder is positioned. The joint holder actsto brace the joint formingmechanisms in position and also serves to hold the cap upon the top of`Lhc ller head I3 to inclose the edging bar I6. After the concrete hasbeen poured to embed the joint forming mechanisms including the cap I9and the joint holder, the stakes 23 are removed by means of the handles25 and the main portion of the joint holder is pulled upwardly out ,ofthe soit concrete together with the cap I9.

The removal of the cap I9 and the joint holder is done before the lastpass of the concrete iinishing machine.

With the removal of the cap I3 and the joint holder. the concrete whichis Still soft fills the voids left by removal of the cap I9 and thejoint holder. The removal of the cap I9 exposes the edging bar I6 topermit the soft concrete to extrude against the opposite sides of saidbar. After thc initial set of the concrete, the upper corners of theconcrete slabs I on opposite sides of the bar I6 are edged or rounded asillustrated in Figure 3. When the edging is completed, the edging bar I6together with the pins II is pulled I3 to leave a narrow crack or groovei8 between the top portions of the concrete slabs above the top seal orhead I3 of the joint. The top groove or crack I8 is now lled to a pointnear the top surface of the concrete, with a compound filler, such astar or the like, to form a narrow plastic filler or top rib 26 to sealthe top o1 the joint above the top seal or head I3.

The removed edging bar I6 and the joint holder are adapted to berepeatedly reused for the purpose of securely bracing load transmissionexpansion joint forming mechanisms in position during the pouring ofconcrete, with the edging bar I6 inclosed by the cap I9 during thepouring of concrete and later on serving as a means for edging the uppercorners of the concrete slabs and for forming a narrow top crack orgroove above the joint for the reception of a compound filler to sealthe top of the joint.

In the modified form of the device illustrated in Figures and 6, theparts which are identical with those illustrated in Figures l to 4inclusive are designated with like numerals. In this modified formof thefiller mechanism, the reference numeral 26 indicates a precast plasticcore board, the lower edge of which is adapted to be seated in a loadtransmission base similar to the type illustrated in Figure 2, or ifpreferred the plastic core board may be seated upon any other suitabletype of joint forming base. Seated upon the top surface of the plasticcore board 2t is a metal crosshead consisting of two overlappin'g metalplates 27 the outer margins of which are bent downwardly and inwardly4to form stiiening beads or hems 28. The crosshead plates 27 areprovided with openings 29 in the overlapping margins thereof to permitthe pins I'i of the edging bar I6 to be projected downwardly throughsaid openings into the plastic filler board 26. The metal crossheadplates 2l are preferably formed of rolled copper and are provided with aseries of openings 30 adjacent the rolled margins thereof as clearlyillustrated in Figure v6. 'Ihe openings 30 are adapted to be filled withconcrete and together with the rolled margins 28 of said copper platesserve as a means for anchoring the plates in the opposite concrete roadslabs 2. 'I'he upper portion of the joint is adapted to be completedafter the removal of the cap I3 and the holder mechanism and after theedging bar I 6 together with the pins II have been removed to leave thenarrow space at the top of the joint to be filled with a compound fillersimilar to the arrangement i1- lustrated in Figure 4.

Figures 7 and 8 illustrate another modified form of expansion joint coreunit comprising a precast asphalt core board 3| provided with a centraltop groove 32 which extends throughout the entire length of the coreboard. Seated upon the top of the plastic core board 3| is a metalcrosshead or upper joint seal comprising two rolled copper plates 33 theouter longitudinal edges of which are rolled downwardly to providereinforcing feet or margins 36 while the inner longitudinal margins ofthe copper plates 33 are deflected downwardly to form flanges 35 whichproject downwardly into the topmiddle groove 32 of the core board 3|.WThe copper plates 33 are provided with openings 36 for the reception ofconcrete to assist in anchoring the plates 33 in the concrete road slabs2. Seated upon the top of the copper plates 33 is a steel edging bar I6provided with downwardly projecting pins I'I which wedgingly projectdownwardly between the flanges 35 ofthe copper plates 33 and into theplasticmaterial forming the core board 3|.

Figure 9 illustrates another modified form of an expansion joint formercomprising a precast asphalt core board 31 provided with `alongitudinally disposed middle top groove at 38.

Seated upon the top of the core board 31 is a. copper crosshead plate39, the margins of which are rolled over to form reinforcing rims orbeads ed. The margins of the plate 39 are provided with concretereceiving apertures di. The cen- Seated upon the top of the copper plate39 is a precast. asphalt top seal or crosshead bart3 which is adapted tobe secured in place by means lo of nails dd or other suitable meanswhich are driven downwardly through the bar and the copper plate 39 andinto the core `board 31. The pins il of the edging bar are adapted to bedriven or forced downwardlyl into the` plastic. crosshead bar d3 toremovably hold the edging bar I6 in position.

Figure 10 illustrates another modified form of an expansion jointforming unit' includingin combination a precast asphalt core board i@similar to the core board' illustrated in Figures 1 to 4 inclusive,having metal core plates d5 positioned on opposite sides thereof incontact with the bosses ii. Seated upon the top of the core board i0 isa copper crosshead plate t6 the middle portion of which is formed toprovide a channel 4l which fits over the upper portion of the coreboard. The outer margins. of the 'copper crosshead plate de are turned.downwardly and inwardly to form reinforcing ribs or margins I8.A The topof the channel portion 61 of the crosshead member. is provided withspaced apertures for the reception of the pins il of a steel yedging barle.

' The various forms of expansion void forming mechanisms illustratedv inFigures 5 to 10 inclusive are adapted to be used in combination with a.load transmission plate mechanism similar to that illustrated in Figures2 and 3 or with any other suitable type of joint forming base which willclose the bottom of the expansion joint. y y

In actual practice the base unit with the core forming mechanism seatedthereon and having the removable metal edging bars mounted in place areassembled and are wired or secured the joint forming mechanism areshipped separately and are adapted to be readily engaged in positionwith the cap I 9 disposed over the edging bar after which the stakes 23are driven intoy the subgrade as illustrated in Figure 2 to holdthejoint forming mechanism properly braced in position to permit thepouring of con` crete without disturbing the position 'of the jointformingl mechanism.

It will of course be understood that various details of construction maybe varied through a wide range without departing from the principlesof'this invention and it is therefore not the purpose to limit thepatent granted hereon otherwise than necessitated by the scope of theappendedclaims.

I claim as my invention:

1. In a joint formingmechanism for embedding between concrete sectionsof a road vthe combination with an expansion joint base, of a preformedcore supportedthereon and` including a top seal head, plates secured onopposite sides of the plasticfiller and supported by said base with thetopsof said plates formed to seat around the bottom corners of the topseal head, an

l75 edging bar including pins to be driven into the be embedded inconcrete. The bracing units forv top seal head to hold the edging barremovably secured in. place upon the top seal head, and a joint holderfor bracing the joint forming mechanism in place and including a capforv enclosingthe edging bar, apertured brackets secured to the cap,legs secured to the apertured brackets and braced against the base, stopmembers on the brackets engaged against the vtop seal head,stakesprojecting through the apertured brackets and driven into the roadsubgrade to hold the joint forming mechanism braced in position duringthe pouring of concrete, and handles on the stakes for removing the sameand the joint holder after the pouring of con.

crete.

2; In a road joint forming mechanism for embedding between concrete roadslabs upon the road subgrade the combination of an expansion joint base,of a precast filler .supported thereon, a preformed top seal head ofplastic material seated upon the top of the filler, plates supported onthe base and engaged against opposite sides of the iiller and said topseal head, an edging bar including stakes which are driveninto the topseal head for holding the edging bar removably secured in position, ajoint'holderpositioned 'against one side of the base and the iiller andincluding a cap for inclosing the -removable edging bar, and means forsecuring the joint holder in position to brace the joint formingmechanisms including. the j'oint holder cap in position during thepouring of concrete for the formation of the road slabs between whichthe joint is A form-ed.

3. In an expansion joint forming mechanism including a preformedplastic-lier, the combination of an edging bar including pins driveninto the plastic iiller for holding the edging bar in place, a jointholder including a'cap removably erigaged on the top of the plasticfiller for enclosing the edging bar, bracket means for holding the capin position, and securing stakes engaged with the bracket means andreleasably driven into the road subgrade for bracing the joint formingmechanism in position during the pouring of concrete to form road slabs;

4. The combination with a concrete' road expansion joint formingmechanism including a. preformed plastic filler, of a metal edging bar,of less thickness than the iiller and seated on edge thereon leavingstrips of the top of the ller exposed to be covered by concrete and pinssecured in the edging bar and driven into the precast ller forreleasably holding the edging bar in position to permit edging of theconcrete slabs forming part of the concrete road after the initial setof the concrete and before the removal of the edging bar and the pins toform a narrow crack above the precast ller for the purpose of receivinga top filling to seal the top of the joint.

5. In an expansion joint forming mechanism including a precast plasticller, of an edging unit comprising a metal edging bar, and pins securedtherein to be driven into the plastic filler for holding the edging baron edge spaced inwardly away from the uppercorners of the in position onedge and spaced inwardly away from the top corner edges of the ller tofacilimetal edging bar seated on edge upon the precast nller,.and pinssecured to the edging bar and projecting into the precast ller forholding the edging bar in position with the sides thereof spacedinwardly away from the top corner edges of the filler.

8. The combination with a precast plastic filler for a road joint, of anedging bar of less thickness than the filler and supported on edgethereon, and pins forming a part of the edging bar and driven into theplastic iiller for holding the bar in place leaving parts oi' the topsurface of the filler exposed on opposite sides of the bar.

9. An expansion` joint brace mechanism comprising a channel cap, aplurality of brackets se` cured to one side thereof, stop memberssecured to said brackets, legs on said brackets for supporting the samein position, and removable stake members engaged with the brackets forreieasably securing the joint holder in place.

l0. An expansion joint holder comprisinga cap, apertured bracketssecured to one side ci the cap, stop members secured to the brackets,legs on the bottoms of the brackets, and stake members projectingthrough the brackets and including handles for the removal of the stakesto permit removal of the joint holder from concrete poured on oppositesides of the joint. Y

11. Thc combination with an expansion joint forming mechanism forembedding between concrete road slabs, of a joint holder for saidmechanism including'a channel cap, apertured brackets secured to thecap, legs for bracing the brackets in position, stakes releasablyprojecting through the apertured brackets, and handles projecting fromthe upper portions of the stakes to facilitate removal of Athe stakesfrom the brackets and also serving to prevent the stakes from beingdriven completely through the brackets.

12. The combination with a precast plastic expansion joint filler forembedding in concrete for the formation of a joint between concrete roadslabs, of a.. narrow steel edging bar including tapered pins to bedriven into the precast ller to hold the edging bar in position, and ajoint `holder for bracing the precast ller in position during thepouring of concrete and comprising a channel shaped cap for seating uponthe top of the precast filler to enclose the steel 'edging bar,apertured brackets secured to one side of the cap, stop members on thebottoms of the brackets for engaging against one side of the plasticiiller to brace the same, supporting legs formed on the bottoms of thebrackets, stakes projecting through the apertured brackets adapted to bedriven into a road subgrade to secure the joint holder in place forbracing the cap and the pre-k cast filler in place during the pouring ofcon-- crete, and armsprojecting from the stakes above the brackets forremoving the stakes after the completion of the joint and also servingto prevent the stakes from being driven through the apertured brackets.

13. In an expansion joint forming mechanism including a precast plasticiller, of an apertured crosshead -plate supported on top of the filler,a

, 5 steel edging bar including pins projecting from the bottom thereofto be driven through the plate and into the plastic ller for' holdingthe edging bar and plate in position during the formation of 4a joint.

14. The combination with a precast plastic expansion joint filler forembedding in concrete for the formation of a joint between concrete roadslabs, of an apertured 'metal plate means seated upon the top of theller, and a steel edgingbar seated on the plate means and having pinsprojecting through the plate means and into l the precast ller.

15. The combination with a precast plastic expansion joint ller forembedding in concrete for the formation of a jointy between concreteroad slabs, of an apertured metal plate crosshead seated upon the top ofthe ller and projecting' beyond the sides thereof, a steel edging barseated upon the apertured crosshead, and Wedge pins projecting from theedging bar and projecting through aperturesdn the crosshead to engage inthe precast ller.

16. 'Ihe combination with a precast plastic expansion joint ller forembedding in concrete for the formation of a joint between concrete roadslabs, of an apertured metal plate crosshead seated upon the top of thefiller and projecting beyond the sides thereof. a steel edging barseated upon the apertured crosshead, wedge pins projecting from theedging bar and projecting through apertures in the crosshead to engagein the precast filler, a cap engaged over the edging bar and seated onthe crosshead and brace members connected with the cap for temporarilyholding the same `in position during the pouring of concrete for theformation of the joint.

17. The combination with a precast plastic expansion joint nller forembedding in concrete vfor ythe formation of a joint between concreteroad slabs, of an apertured metal crosshead plate seated upon the fillerand projecting beyond the sides thereof. a precast plastic bar seated onthe plate, a steel edging bar supported upon the pre-- cast plastic bar,and wedge pins secured in the steel edging bar and projecting into theplastic br to releasably hold the steel edging bar in pos ion.

18. The combination with a precast plastic expansion joint iiller forembedding in concrete for the formation of a joint between concrete roadslabs, of an apertured metal crosshead plate seated upon the iiller andprojecting beyond the sides thereof, a precast plastic lbar seated onthe plate, a steel edging bar supported upon the precast plastic bar,wedge pinsk secured in the steel edging bar and projecting into theplastic bar to releasably hold the steel edging bar in position, a capseated over the edging bar and resting on the precast plastic bar, bracemembers secured to one side 'ofthe cap, and removable stakes forengaging the brace members to hold the same in position during thepouring o! concrete for the formation of the joint.` j

19. The combination with a precast plastic expansion joint iiller forembedding in concrete for the formation of a joint between concrete roadslabs, of apair of apertured overlapping crosshead plates seated uponthe ller, an edging bar seated on the crosshead plates, and Wedge pinssecured in the edging bar and projecting through the aperturedoverlapping crosshead plates into the plastic ller.

20. The combination of a precast plastic expansion joint filler forembedding in 'concrete for tic 311er.

21. The combination with a, e: plastic expension joint Eller for embedin concrete for the formation of a joint` between concrete road slabs,of` a. plurality of epertured crosshead plates seated upon the ller andincluding enges which `project downwardly into the filler, an edging barSeated on the cr my.. plates, and wedge members eecured in'vthe edgingbar and projecting e downwardly between the enges of the cead platesinto the ntic ller. A BRT R. ROBERN.

